1. A glassmelting method which reduces alkali corrosion in a glassmelting furnace with oxy-fuel burners comprising:
(A) providing glassmaking materials including alkali species into the glassmelting furnace;
(B) providing fuel and oxidant into the furnace through the oxy-fuel burners wherein the atomic ratio of hydrogen to carbon in the fuel provided through one or more of the oxy-fuel burners is less than 0.9; and
(C) combusting the fuel and oxidant therein to provide heat to the glassmaking materials to form molten glass.
2. The method of claim 1 wherein the atomic ratio of hydrogen to carbon in the fuel provided through one or more of the oxy-fuel burners is less than 0.6.
3. The method of claim 1 wherein the atomic ratio of hydrogen to carbon in the fuel provided through one or more of the oxy-fuel burners is less than 0.4.
4. The method of claim 1 wherein said fuel comprises carbon monoxide.
5. The method of claim 1 wherein said fuel comprises petroleum coke.
6. The method of claim 1 wherein said fuel is solid.
7. The method of claim 6 wherein said fuel is injected into the furnace in mixture with transport gas which contains less than 10% nitrogen in volume.
8. The method of claim 6 wherein said fuel is injected into the furnace with transport gas at least a portion of which is cooled flue gas from said glassmelting furnace.
9. The method of claim 1 wherein the atomic ratio of hydrogen to carbon in the fuel provided through all of the oxy-fuel burners is less than 0.9.
10. The method of claim 1 wherein said oxy-fuel burners provided with said fuel with the atomic ratio of hydrogen to carbon of less than 0.9 are placed in the hotter area of the furnace and other oxy-fuel burners in said glassmelting furnace are fired with a fuel with the atomic ratio of hydrogen to carbon of greater than 0.9.
11. The method of claim 1 wherein said oxy-fuel burners provided with said fuel with an atomic ratio of hydrogen to carbon of less than 0.9 are placed in the charge end of the furnace and other oxy-fuel burners in said glassmelting furnace are fired with a fuel with an atomic ratio of hydrogen to carbon of greater than 0.9.
12. The method of claim 1 wherein said fuel is provided into the furnace in mixture with transport gas at least a portion of which is combustible, and the atomic ratio of hydrogen to carbon in the mixture of fuel and transport gas is less than 0.9.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1-10. (canceled)
11. A method for purifying carbon nanotubes, the method comprising:
immersing carbon nanotubes into a solution in which a template compound consisting of a plurality of receptor regions each including a conjugated ring structure and a spacer region that fixes the receptor regions is dissolved, and extracting specific carbon nanotubes into the solution; and
recovering the extracted carbon nanotubes.
12. The method according to claim 11, further comprising:
immersing the carbon nanotubes into the solution in which the template compound including an oleophilic substituent in at least one of each of the receptor regions and the spacer region is dissolved, and extracting the specific carbon nanotubes into the solution; and
recovering the extracted carbon nanotubes.
13. The method according to claim 11, wherein
the extracting includes performing ultrasonic irradiation.
14. The method according to claim 11, wherein the recovering includes centrifuging.
15. The method according to claim 11, wherein the extracting includes using tetrahydrofuran as a solvent.
16. The method according to claim 11, wherein each of the receptor regions includes a porphyrin or pyrene skeleton.
17. The method according to claim 16, wherein metal elements are coordinated on the porphyrin skeleton.
18. A carbon nanotube, wherein metal elements that can be coordinated on a porphyrin skeleton is carried on a surface.
19. The carbon nanotube obtained by the purifying method according to claim 11.
20. A carbon nanotube, wherein
a half width of a peak appearing near a spectrum of 200 cm\u22121 obtained by a Raman scattering measurement is equal to or smaller than 20 cm\u22121.